Baiomyini. Until diagnosed by Thomas, species associated here had been affiliated with Akodon (e.g., Bangs, 1902) and later the genus with akodontines (Vorontsov, 1959). Common ancestry with Baiomys inferred on the basis of shared morphological traits (Carleton, 1980; Carleton et al., 1975; Hooper, 1960; Hooper and Musser, 1964b) and phylogenetic evaluation of mitochondrial and nuclear genes (D’Elía, 2003; Engel et al., 1998), a relationship weakened by karyological banding data (Rogers and Heske, 1984). Also see comments under Baiomys. Revised by Hooper (1972); for other aspects of biology and systematics, see Carleton et al. (1975), Hooper and Carleton (1976), and Rogers and Heske (1984).